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differential ratio help
Hi there.
I have a 1984 BMW 533i with 420,000 miles on it and have been averaging about 25 mpg. I have been considering swapping out the differential for a better ratio but I was wondering how much of a gain it might make. Anybody better with a calculator than I am care to lend a hand?
Stock ratio = 3.25:1
alternate 1 = 2.93:1
alternate 2 = 2.79:1
I can get ahold of the 2.93 pretty easy, the 2.79 might take a bit of searching but they are out there. Any suggestions or thoughts on how much either might help my mpgs?
Thanks for the help.
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